1640s ke ngwagasome tšhupamabakeng ya Gregorian wa go thoma ka 1 Pherekgong 1640 ya fela ka 31 Manthole 1649. Ngwagasome 1640s o wela ngwagengkgolo wa 17.
| Ngwagakete: | Ngwagakete 2 |
| Mengwagakgolo: | Ngwagakgolo 16 – Ngwagakgolo 17 – Ngwagakgolo 18 |
| Mengwagasome: | 1610s 1620s 1630s – 1640s – 1650s 1660s 1670s |
| Mengwaga: | 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 |
| 1640s-tšago tswalanya: |
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